Politicians will continue running large deficits as long as the bond market tolerates it by keeping interest rates low. The ultimate correcting mechanism for government spending isn't political discipline, but the bond market's impersonal decision to raise rates, forcing fiscal responsibility.

Manny Roman argues that debt-to-GDP is an incomplete metric for debt sustainability. He suggests comparing national debt to total household savings, which reveals a vast, taxable pool of private wealth in countries like the US and Japan. This lens makes current high debt levels appear more manageable.

To escape a debt crisis without total collapse, a nation must delicately balance four levers: austerity (spending less), debt restructuring, controlled money printing, and wealth redistribution. According to investor Ray Dalio, most countries fail to find this balance, resulting in an "ugly deleveraging" and societal chaos.

Counterintuitively, the absolute size of the national debt has less impact on interest rates than the pace of its growth. As long as the debt expands at a rate within investor expectations, even a massive increase in the total amount—like the recent $9 trillion addition—may not significantly alter long-term Treasury yields.

In a model where government spending injects new money into the system, government debt is intrinsically linked to GDP growth. The idea that this debt can grow unsustainably faster than the economy is flawed, as the debt itself is a mechanism for that economic growth.

To combat out-of-control deficits, a simple rule should be implemented: for every new dollar of tax revenue, the government is only allowed to spend a fraction, like 70 cents. This forces fiscal discipline and ensures that increased revenue actually reduces debt rather than funding more spending.

Government projections showing exponential, unsustainable debt growth are flawed because they model a straight line forward, ignoring historical data. As economist Steve Keen points out, debt-to-GDP ratios have always fluctuated in cycles; modeling a continuous, ahistorical trend is inherently misleading and creates false alarms.

A key metric for debt sustainability is the relationship between the average interest rate on all outstanding debt (R) and nominal GDP growth (G). The US is currently in a favorable position with R at 3.6% and G higher. However, rising short-term rates threaten this dynamic, which could accelerate debt ratio increases.

The optimal strategy for high-debt economies is growing out of the problem. However, this growth pressures the bond market. The key challenge is maintaining this strategy without resorting to politically explosive benefit cuts or inflationary money printing.